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- University of WaterlooCA140 papers
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8 papers · 2 filters
Gravitational effects of condensate dark matter on compact stellar objects
Xinyu Li, Fayin Wang, K. S. Cheng
We study the gravitational effect of non-self-annihilating dark matter on compact stellar objects. The self-interaction of condensate dark matter can give high accretion rate of da…
Non-Gaussianity from Axionic Curvaton
Masahiro Kawasaki, Takeshi Kobayashi, Fuminobu Takahashi
We study non-Gaussianity of density perturbations generated by an axionic curvaton, focusing on the case that the curvaton sits near the hilltop of the potential during inflation.…
Do stochastic inhomogeneities affect dark-energy precision measurements?
Ido Ben-Dayan, Maurizio Gasperini, Giovanni Marozzi +2
The effect of a stochastic background of cosmological perturbations on the luminosity-redshift relation is computed to second order through a recently proposed covariant and gauge-…
The abundance of (not just) dark matter haloes
Till Sawala, Carlos S. Frenk, Robert A. Crain +4
We study the effect of baryons on the abundance of structures and substructures in a Lambda-CDM cosmology, using a pair of high resolution cosmological simulations from the GIMIC p…
Backreaction on the luminosity-redshift relation from gauge invariant light-cone averaging
Ido Ben-Dayan, Maurizio Gasperini, Giovanni Marozzi +2
Using a recently proposed gauge invariant formulation of light-cone averaging, together with adapted "geodesic light-cone" coordinates, we show how an "induced backreaction" effect…
Where will Einstein fail? Lessons for gravity and cosmology
Niayesh Afshordi
Einstein's theory of General Relativity is the benchmark example for empirical success and mathematical elegance in theoretical physics. However, in spite of being the most success…